Resources

RDL Stick-on series is a range of small enclosed “black boxes” with screw terminals on one side, and a self-adhesive strip on the base. This range, already popular in America offers a simple, high quality solution to temporary or permanent interfacing, communication and distribution problems especially in theatre, PA and broadcast.

A single channel power amplifier with versatile mic input and dual mute switching circuit. The input accepts dynamic and condenser mics (with a separate phantom power input) or an 8 or 45 ohm speaker, and the output can be connected to any load of 4 ohms impedance or greater, delivering more than 1W rms into an 8 ohm load. The dual mute circuit allows master station override of a slave station, with a built in 15mS delay to avoid feedback. Frequency response: voice band ±2dB 300Hz–4kHz; gain range: off –70dB; Input level for 1W rms output: –60dBU (8R source), –55dBU (600R source), maximum power: 1.5W rms. Supply: Single 175mA.

Provides two phantom power supplies from a single DC input. The phantom voltage is adjustable up to approx 92% of incoming supply, up to P24 24Vdc as per standard IEC 61938: 2013. Protects mixer inputs from phantom power. Frequency response: 20Hz–100kHz ±0.025dB. Supply: single 35mA.

A DPDT relay with LED indicator, operated by applying a control voltage 3.5-35VDC, or a switch or open-collector closure to ground. A slave output is also available for indication or linking. Max switching current: 2A; max switching voltage: 220VDC, 250VAC; max switching power: 60W. Supply: single 50mA.

Audio controlled DPDT relay featuring control switching from voice signals of mic or line level. When used in intercom or talkback applications, it may be triggered directly from an unbalanced microphone. It releases very quickly, but holds on through very short pauses in syllables common to speech. These time constants allow the design of a communications system yielding comfortable two-way conversation. Multi-turn presets for sensitivity and release delay. Input impedance: mic 5k unbalanced, line 200k unbalanced. Sensitivity: mic –80dBv to –50dBv, line –45dBv to –15dBv. Activation response 5mSec release relay adjustable 70 to 260mSec. Maximum switching current: 2A; maximum switching power 60W. Supply: single 50mA.

AUDIO OSCILLATORS

These two modules each offer two, separate, fixed frequency, precision sine wave signal generators each with AGC-stabilised and user adjustable amplitude. Two outputs, each of 200 ohms output impedance, are provided for each frequency, each for connection to balanced or unbalanced circuits. Output level: “Off” to +14dBV (600 ohm load), supply input: dual 80mA. Frequencies are 1KHz plus 10kHz for ST-OSC2A and 100Hz plus 400Hz for ST-OSC2B, with distortion of 0.5% and <3% respectively. Supply: single 80mA.

CROSSOVERS

A line level equaliser/crossover designed to act as a high pass channel for full range speakers to be used with ‘woofer’ speakers (below 100Hz). The equaliser has a 100Hz-30kHz pass band with 18dB/octave low frequency roll-off and a mid-band equaliser giving up to 8dB attenuation centred at 2kHz on the full range output, and a 40Hz-165Hz pass band with a low frequency equalisation of up to 10dB at 50Hz on the woofer output. Input line level: +4dB nominal, balanced or unbalanced; headroom: >18dB; THD: <0.075% (full); <0.025% (woofer). Noise <80dB. Supply: single 40mA.

A line level equaliser designed to act as a sub-bass frequency channel for subwoofer speakers. The equaliser has dual bridging inputs and 22Hz-80Hz pass band and an adjustable equaliser centred at 32Hz for boosts from flat to +5.5dB. This unit is ideal where a single additional sub-woofer is to be added to stereo speaker systems, or for use with other ST-CX2 products. The CX2S is supplied factory set to match the JBL model 4645B THX approved sub-woofer. Input line level: +4dB nominal, balanced or unbalanced, bridging; headroom: >18dB; THD: <0.05%. Noise <90dB. Supply: single 30mA.

A balanced line level high pass filter with two filtered outputs (300Hz and 500Hz), the first providing 18dB/octave roll off at 225Hz, the second 18dB/octave roll off at 450Hz, designed to protect horn loudspeakers from damage by low frequency signals. Inputs and outputs may be wired unbalanced, if required. Frequency response: ±0.5dB 300Hz-30kHz (300Hz out), ±1.0dB 500Hz-30kHz (500Hz out); THD and noise: <0.01%; insertion loss: <2dB; Headroom: >18dB. Supply: single 30mA.

Six single ferrite suppressors for the reduction of RF signals. These may be used to suppress RF pick up in signal or screen wires, depending on the situation. Two ground terminals are also provided. Attenuation >10dB at 10MHz, >25dB at 200MHz.

NOISE/RAMP GENERATORS

A white or pink noise generator with separately adjustable mic and line level balanced outputs. The truly random noise source occupies the full bandwidth 20Hz-20kHz with amplitude limiting circuitry to control peak excursions while maintaining random variations of at least 20dB. Ideal for system alignment and measurement and noise masking. Supply: single 30mA.

A ramp generator with 0-10 VDC output. Two control ports, “up” and “down” with tally LED drives to show status. Normally open switches applied to the control ports ramp the output up or down, leaving the output stable in the last set conditions when released. When used in conjunction with RLC1/RLC2 and ST-VCA1 a complete remote volume control system can be put together. LED O/P current 3mA; Ramp O/P 0 to 10V nominal; Ramp time 5 sec max; supply: Single 40mA.

TELEPHONE COUPLERS

Primarily intended to be connected to an on-site telephone system switching unit. Connections from the ST-TC1 go into the switching unit as if it were a normal extension line (viz. in place of an extension telephone). When the line the ST-TC1 is connected to is seized, a relay contact closure is provided which can be used to control a variety of equipment, such as paging priority access or channel open, or radio “PTT”. The closure is maintained as long as the line is selected. A 600R transformer isolated audio feed is available for audio input/output. Switching contacts are double pole double throw, rated 60 watts 125VA. Max. switching voltage 220VDC, 250VAC, 2A. Supply: 50mA single.

The ST-VP2 offers fully automatic voice-over mixing, useful also for noiseless paging interrupts. It features adjustable fade depth 0dB to 25dB (plus fully off), and has adjustable recovery rate (2sec - 4sec), together with AGC on the music input (18dB range, 6dB compression at normal input level, 25msec attack time, 2.5sec release. The music and voice inputs are both line level, and an adjustable threshold gate mutes the voice channel between paging announcements. LED’s are provided to show the correct operating level for each input, to aid set-up. 24-33VDC 35mA.

POWER DISTRIBUTION

This unit provides five individually de-coupled and diode isolated outputs from a single DC input. Typically it would be used to provide the supply voltage to five individual Stick-On modules from a single, possibly remote, source. One ST-PD5U should be used per power rail employed, ie: one to feed single-rail devices, two to feed dual-rail devices. Avoid mixed use! Input voltage 0-36VDC, output voltage typically 0.7VDC less than input.

Mounting Accessories

ST series modules are supplied with a self-adhesive foam pad which can be used to attach the module to a clean flat surface. A range of accessories are available for mounting modules. In addition the modules may be fitted in conjunction with RDL Flat-Pak and RDL Rack-Up modules in certain of the housings designed for these.

Powering

Apart from passive modules, all Stick-ons require either a single 24-33V DC rail or a dual-rail 12-0-12 to 16-0-16V DC supply. In extreme circumstances it may be possible to operate units requiring dual rail supplies from a single floating DC supply, in which circumstances the +ve rail should be connected to the +ve power terminal and the 0V or ground rail should be connected to the –ve terminal of the power input with no external connection to the 0V power terminal. Modules connected in such a way must not have either input or output connected to ground, and we would not recommend such usage unless the client feels competent to make educated decisions about this configuration.